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2.
Motivation
➢ Media plays a crucial role in public dissemination of
information
➢ However, people believe there is substantial media bias in
news in view of inter-dependencies and cross-ownerships of
media companies and other industries (like energy)
➢ 4 out of 5 Americans among younger generations do not trust
major news networks [Gallup poll, 2013]
➢ This work: Credibility Analysis of News Communities

3.
News Community
➢ A news community is a news aggregator site (e.g., reddit.com,
digg.com, newstrust.net) where:
➢ Users can give explicit feedback (e.g., rate, review, share) on the
quality of news
➢ Interact (e.g., comment, vote) with each other
➢ However, this adds user subjectivity as users incorporate their
own bias and perspectives in the framework
➢ Controversial topics create polarization among users which
influence their evaluation

4.
Contributions
● A model to capture joint interaction between language,
topics, users and sources leading to better prediction than
the ones in isolation
● User expertise, source trustworthiness, language objectivity,
topical perspective and article credibility mutually reinforce
each other
● A supervised Conditional Random Field model that can
capture these interactions, and handle real-valued ratings

12.
Credibility Analysis
➢ Given a set of news sources generating news
articles, and users reviewing them on different
qualitative aspects with mutual interactions:
➢ Jointly rank the sources, articles, and users based
on their trustworthiness, credibility,and expertise

24.
Maximize log-likelihood with respect to log λk
instead of λk
Prediction is the expected value of the function given by
the mean of the Multivariate Gaussian distribution:
Constrained optimization problem.
Gradient ascent cannot be directly used.

34.
Ongoing Work
➢ Analyze temporal evolution of these factors
➢ Communities are inherently dynamic in nature
➢ Source trustworthiness, and user expertise change
with time
➢ To this end we propose an Experience-aware Item
Recommendation for Evolving Review Communities,
ICDM 2015.